1. Pettey, C., Goasduff, L.: Gartner executive programs worldwide survey of more than 2,000 CIOs identifies cloud computer as top technology priority for CIOs in 2011. Gartner Research, Stamford (2011)
2. Mell, P., Grance, T.: The NIST Definition of Cloud Computing (2011)
3. Sabahi, F.: Cloud computing security threats and responses. In: 2011 IEEE 3rd International Conference on Communication Software and Networks (ICCSN) (2011)
4. Canonical. Ubuntu Cloud: Technologies for future-thinking companies 2012.
http://www.canonical.com/about-canonical/resources/white-papers/ubuntu-cloud-technologies-future-thinking-companies
5. Cloud Security Alliance: About Cloud Security Alliance:
https://cloudsecurityalliance.org/research/security-guidance